Multiple electrical conduit receptacle and plug



Nov. 1, 1932. M. J. DE MASK 1,835,513

MULTIPLE ELECTRICAL CONDUIT RECEPTACLE AND PLUG Filed Dec. 8. 1 2 Sheets-Sheet l Mariz're J De Mask.

a, Gum/m1 Nov. 1, 1932. M. J. DE MASK 1,885,513

MULTIPLE ELECTRICAL GONDUIT RECFJP'IACLE AND PLUG F1199! Dec. 8, 1927 2 Sheets-Sheet 2 inuomfoz 2 M'ari'z'zv J v.De Mask,

Patented Nov. 1, 1932 MARTIN J. DE MASK, OF PITTSFFELD, MASSACHUSETTS MULTIPLE ELECTRICAL CONDUIT RECEPTACLE AND PLUG Application filed. December 8, 1927.

This invention provides a conduit recepta-cle to be applied to the walls or ceilings f factories, garages, shops and like places where it is required to plug in fixtures at different points.

The invention contemplates a core sulatingmaterial, electrical spaced relation thereby and a tubular of inconductors mounted upon the core and maintained 1n casing enclosing the core and electric conductors and forming protective and reinforcing lIlCtIIlS best adapted for the purpose.

While the drawings illustrate a preferred embodiment of the invention it is to be understood that in adapting the means to meet specific needs and requirements, the design may be varied and changes in the minor of construction may be resorted to the scope of the invention as claimed details within witln out departing from the spirit thereof.

For a full understanding of the invention to the following description and the ings hereto attached, in which and the merits thereof, reference isto be had draw- Figure 1 is a top plan View of a conduit receptacle embodying the invention,

an interinediate portion being broken away.

Figure 2 is a sectional view on the line 22 of Figure 1.

Figure 3 is a horizontal sectional view on the line 3-3 of Figure 2, showing the joint between two lengths of conduit.

Figure 4 is a view of part of a length of conduit as seen from the bottom side.

Figure 5 is a sectional view of a plug. Figure 6 1s a sectional view of a nodified form of conduit.

Figure 7 is a detail view of the modification shown 1n Figure 6, as seen from the bottom side.

Figure 8 is a sectional view of a further modification.

Figure 9 is ayiew of the modification shown in Figure 8, as seen from-the bottom side.

F gure 10 is another modification appeal-sin sectlon.

,as it sition, or fiber.

Serial No. 238,683.

Figure 11 is a bottom View of the modification shown in Figure 10.

Figure 12 is a longitudinal sectional View of a further modification showing the joint between two lengths and the manner of con- 5 necting the conduit to a box.

Figure 13 is a sectional View of a different form of plug.

Figure 14 is a side view of the plug illustrated in Figure 13.

Corresponding and like parts are referred to in the following description and designated in the several views of the drawings by like reference characters.

The numeral 1 designates the casing which 5 usually consists of metal of tubular form. This casing may be of any length and is adapted to be secured to the walls and ceilings of the structure to be wired, so that fixtures may be plugged therein at determinate convenient points. A core of insulating material is fitted within the casing 1 and is protected and strengthened thereby. This core may be variously formed as illustrated n Figures 2, 6, 8 and 10 of the drawings, and may consist of any material, such as compo- Electric conductors 2 are mounted upon the core and are held in spaced relation thereby. The core 3 shown most clearly in Figures 2 and 3iills the casing 1 and is formed with parallel channels 4:, in the outer walls of which are embedded the electric conductors 2. A. side of the casing 1 cpposite the channels 4: is cut away for the reception of the prongs 5 of aplug 6 to admit of any fixture being plugged in at any point in the length of the conduit receptacle. The cut away portions "of the casing may consist of pairs of openings 7 or a transverse opening Sor a longitudinal opening 9. The pairsof openings 7 are adapted to receive the prongs 5 of the plug and register with the channels 4. The transverse opening 8 is for a like purpose and connects with both channels 4. The openings-7 and 8 are of a size to receive than; prongs 5 and are located at intervals in the length of the conduit. The opening 9 may be of any length, thereby admitting of plugging in a fixture at any point. As indicated in Figures 7 and 9 a. portion is re- 10.-

moved from the side of the casing 1 and providesan opening coextensive with the length of the casing, thereby admittin of the p ug being slid along the len h of t e conduit if desired, without necessitating the removal of the plug and the replacement thereof and the consequent interruption of current throu h the fixture. The openings Tend 8 may e closed by knock-outs, as indicated most clearly in Figure 11. The core 30. illustrated in Figure 6 partly fills the casing 1, leaving a space 90 which may be utilized as a way for extra conductors or for any desired purpose. In all other respects the core 3a is similar to the core 3, shown in Figures 2 and 3. The core 3?) shown in Figure 8 is of T-form in cross section and the head portion has its longitudinal edges fitted in grooves 10 formed in o posite sides of the casing 1.

In the modi cation shown in F i ure 10 the core 30 consists of a strip and t e same is adapted to be secured within the casing 1 in an determinate way.

'lhe plug 6 shown in Figure 5 has spring fingers 11 attached to opposite sides and outwardly curved, so as to embrace opposite sides of the conduit and assist materially in retaining the plug in place. The plug 12 shown in Figures 13 and 14 is of insulating material and the prongs 13 have their ends deflected inwardly so as to engage the electric conductors 2 of the form of conduit shown in Figures 6,

tor strips embedded flush in the longitudinal Walls of the core.

2. A multiple electric conduit comprising a casing constructed with openings in its side to receive plug terminals and having longitudinal groovesat opposite points of its inner surface, a core of insulation 'T-shaped in cross section having the sides of the stem of the T registering with the openings in the casing and the edges of the head of the T seating in the longitudinal grooves of the casing, and conductor strips embedded flush in the sides of the stem of the T.

In testimony whereof I afiiX my signature. MARTIN J. DE

MASK. [n s.]

8 and 10, and which conductors are disposed at the inner sides of the openings through which the prongs are introduced when placing a plug in position. A metal strap 14 extends along three sides of the plug 12, and its end portions project beyond the plug and are opposltely curved to fit snug against oppo site sides of the conduit receptacle. A strap 15-connects the ends of the strap 14 and extends over the conduit and retains the plug 12 in place.

Connectors 16 and 16a are provided for coupling the conductors 2 of adjacent lengths or sections of conduit. The connectors 16 have their end portions recurved to engage the outwardly disposed conductor 2, whereas the connectors 16a have their end portions deflected to make positive engagement with the inwardly disposed conductors 2, as shown most clearly in Figure 12 of the drawings. A sleeve 17 provides coupling means for the contiguous ends of adjacent lengths or sections of conduit. The parts are connected by a slip joint which may be made secure in any determinate way. A box. 21 has the conduit coupled thereto in any usual or preferred way and the lead in wires 19 may be coupled to the conductors 2 by having their ends slipped into the channels, as will be readily understood. When the box is dispensed with, as I indicated in Figure 3, the lead-in wires 20 are introduced into the channelsin which are located the conductors 2. The ends of the lead- 

